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CVE-2024-0443— Kernel: blkio memory leakage due to blkcg and some blkgs are not freed after they are made offline.

Quick assessment

Affected
CVE-2024-0443
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于block/blk-cgroup.c中的 blkgs destruction路径存在缺陷，导致cgroup blkio内存泄漏。

CVSS 5.5 · Medium EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 9

VendorProduct Version RangeStatus
None None < 6.4-rc7 affected
Red Hat Red Hat Enterprise Linux 6 any unaffected
Red Hat Red Hat Enterprise Linux 7 any unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 8 0:4.18.0-513.5.1.el8_9< * unaffected
any affected
Red Hat Red Hat Enterprise Linux 9 any affected
any unaffected
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.40.1.el9_2< * unaffected

I. Basic Information for CVE-2024-0443

Vulnerability Information
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Vulnerability Title
Kernel: blkio memory leakage due to blkcg and some blkgs are not freed after they are made offline.
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the blkgs destruction path in block/blk-cgroup.c in the Linux kernel, leading to a cgroup blkio memory leakage problem. When a cgroup is being destroyed, cgroup_rstat_flush() is only called at css_release_work_fn(), which is called when the blkcg reference count reaches 0. This circular dependency will prevent blkcg and some blkgs from being freed after they are made offline. This issue may allow an attacker with a local access to cause system instability, such as an out of memory error.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
将私有的资源传输到一个新的空间(资源泄露)
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于block/blk-cgroup.c中的 blkgs destruction路径存在缺陷，导致cgroup blkio内存泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 6.4-rc7 -
Red Hat Red Hat Enterprise Linux 8 0:4.18.0-513.5.1.el8_9 ~ * cpe:/a:redhat:enterprise_linux:8::crb
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.40.1.el9_2 ~ * cpe:/a:redhat:rhel_eus:9.2::appstream
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:rhel_els:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:rhel_els:7
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:rhel_els:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/a:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/a:redhat:enterprise_linux:9
Red Hat Red Hat Enterprise Linux 9 - cpe:/a:redhat:enterprise_linux:9

II. Public POCs for CVE-2024-0443

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III. Intelligence Information for CVE-2024-0443

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Vendor Advisories for CVE-2024-0443 (5)

Other References for CVE-2024-0443 (1)

IV. Related Vulnerabilities

Same weakness: CWE-402